[lld] [lld-macho] Include branch extension thunks in linker map (PR #120496)

[Carlo Cabrera via llvm-commits]

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@@ -8,14 +8,38 @@
 ## (4) early calls to a dylib stub use a thunk, and later calls the stub
 ##     directly
 ## (5) Thunks are created for all sections in the text segment with branches.
+## (6) Thunks are in the linker map file.
 ## Notes:
 ## 0x4000000 = 64 Mi = half the magnitude of the forward-branch range
 
 # RUN: rm -rf %t; mkdir %t
 # RUN: llvm-mc -filetype=obj -triple=arm64-apple-darwin %s -o %t/input.o
-# RUN: %lld -arch arm64 -dead_strip -lSystem -U _extern_sym -o %t/thunk %t/input.o
+# RUN: %lld -arch arm64 -dead_strip -lSystem -U _extern_sym -map %t/thunk.map -o %t/thunk %t/input.o
 # RUN: llvm-objdump --no-print-imm-hex -d --no-show-raw-insn %t/thunk | FileCheck %s
 
+## Check that the thunks appear in the map file and that everything is sorted by address
+# MAP: [[0x[0-9A-Fa-f]+]] 0x[0-9A-Fa-f]+ \[[0-9]+\] _b
+# MAP: [[0x[0-9A-Fa-f]+]] 0x[0-9A-Fa-f]+ \[[0-9]+\] _c
+# MAP: [[0x[0-9A-Fa-f]+]] 0x[0-9A-Fa-f]+ \[[0-9]+\] _d.thunk.0
+# MAP: [[0x[0-9A-Fa-f]+]] 0x[0-9A-Fa-f]+ \[[0-9]+\] _e.thunk.0
+# MAP: [[0x[0-9A-Fa-f]+]] 0x[0-9A-Fa-f]+ \[[0-9]+\] _f.thunk.0
+# MAP: [[0x[0-9A-Fa-f]+]] 0x[0-9A-Fa-f]+ \[[0-9]+\] _g.thunk.0
+# MAP: [[0x[0-9A-Fa-f]+]] 0x[0-9A-Fa-f]+ \[[0-9]+\] _h.thunk.0
+# MAP: [[0x[0-9A-Fa-f]+]] 0x[0-9A-Fa-f]+ \[[0-9]+\] ___nan.thunk.0
+# MAP: [[0x[0-9A-Fa-f]+]] 0x[0-9A-Fa-f]+ \[[0-9]+\] _d
+# MAP: [[0x[0-9A-Fa-f]+]] 0x[0-9A-Fa-f]+ \[[0-9]+\] _e
+# MAP: [[0x[0-9A-Fa-f]+]] 0x[0-9A-Fa-f]+ \[[0-9]+\] _f
+# MAP: [[0x[0-9A-Fa-f]+]] 0x[0-9A-Fa-f]+ \[[0-9]+\] _g
+# MAP: [[0x[0-9A-Fa-f]+]] 0x[0-9A-Fa-f]+ \[[0-9]+\] _a.thunk.0
+# MAP: [[0x[0-9A-Fa-f]+]] 0x[0-9A-Fa-f]+ \[[0-9]+\] _b.thunk.0
+# MAP: [[0x[0-9A-Fa-f]+]] 0x[0-9A-Fa-f]+ \[[0-9]+\] _h
+# MAP: [[0x[0-9A-Fa-f]+]] 0x[0-9A-Fa-f]+ \[[0-9]+\] _main
+# MAP: [[0x[0-9A-Fa-f]+]] 0x[0-9A-Fa-f]+ \[[0-9]+\] _c.thunk.0
+# MAP: [[0x[0-9A-Fa-f]+]] 0x[0-9A-Fa-f]+ \[[0-9]+\] _d.thunk.1
+# MAP: [[0x[0-9A-Fa-f]+]] 0x[0-9A-Fa-f]+ \[[0-9]+\] _e.thunk.1
+# MAP: [[0x[0-9A-Fa-f]+]] 0x[0-9A-Fa-f]+ \[[0-9]+\] _f.thunk.1
+# MAP: [[0x[0-9A-Fa-f]+]] 0x[0-9A-Fa-f]+ \[[0-9]+\] _z
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carlocab wrote:

Maybe I'm missing something, but I don't think these checks do anything since I don't see where you've declared the `MAP` prefix to `FileCheck`.

https://github.com/llvm/llvm-project/pull/120496